将标记设为可拖动后,用户可以使用鼠标或箭头键来拖动地图上的标记。如要使标记可拖动,请将 AdvancedMarkerElement.gmpDraggable
属性设置为 true
。
下例中的地图就展示了一个可拖动的标记,该标记会在拖动完成(触发 dragend
事件)后显示其新位置:
要使用键盘拖动标记,请按以下说明操作:
- 按 Tab 键,直至标记获得焦点。
- 使用箭头键可移动到所需的标记。
- 如要激活拖动功能,请按 Option 键 + 空格键或 Option 键 + Enter 键 (Mac),或者按 Alt 键 + 空格键或 Alt 键 + Enter 键 (Windows)。
- 使用箭头键可移动标记。
- 要将标记放在新位置,请按空格键或 Enter 键。执行此操作也会同时关闭拖动功能。
- 如要关闭拖动功能,并将标记移回之前的位置,请按 Esc 键。
查看代码
TypeScript
async function initMap() { // Request needed libraries. const { Map, InfoWindow } = await google.maps.importLibrary("maps") as google.maps.MapsLibrary; const { AdvancedMarkerElement } = await google.maps.importLibrary("marker") as google.maps.MarkerLibrary; const map = new Map(document.getElementById('map') as HTMLElement, { center: {lat: 37.39094933041195, lng: -122.02503913145092}, zoom: 14, mapId: '4504f8b37365c3d0', }); const infoWindow = new InfoWindow(); const draggableMarker = new AdvancedMarkerElement({ map, position: {lat: 37.39094933041195, lng: -122.02503913145092}, gmpDraggable: true, title: "This marker is draggable.", }); draggableMarker.addListener('dragend', (event) => { const position = draggableMarker.position as google.maps.LatLng; infoWindow.close(); infoWindow.setContent(`Pin dropped at: ${position.lat}, ${position.lng}`); infoWindow.open(draggableMarker.map, draggableMarker); }); } initMap();
JavaScript
async function initMap() { // Request needed libraries. const { Map, InfoWindow } = await google.maps.importLibrary("maps"); const { AdvancedMarkerElement } = await google.maps.importLibrary("marker"); const map = new Map(document.getElementById("map"), { center: { lat: 37.39094933041195, lng: -122.02503913145092 }, zoom: 14, mapId: "4504f8b37365c3d0", }); const infoWindow = new InfoWindow(); const draggableMarker = new AdvancedMarkerElement({ map, position: { lat: 37.39094933041195, lng: -122.02503913145092 }, gmpDraggable: true, title: "This marker is draggable.", }); draggableMarker.addListener("dragend", (event) => { const position = draggableMarker.position; infoWindow.close(); infoWindow.setContent(`Pin dropped at: ${position.lat}, ${position.lng}`); infoWindow.open(draggableMarker.map, draggableMarker); }); } initMap();
设置描述性文本
如要为标记设置可供屏幕阅读器读取的描述性文本,请使用 AdvancedMarkerElement.title
属性,如下所示:
const markerView = new google.maps.marker.AdvancedMarkerElement({
map,
position: { lat: 37.4239163, lng: -122.0947209 },
title: "Some descriptive text.",
});
设置 title
属性后,文本内容可由屏幕阅读器读取,并且将鼠标悬停在标记上时会显示文本。